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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 11198615 B1

PDFFull Text
Date of Patent:
Dec. 14, 2021

Filed:

Dec. 21, 2018

Method of pretreatment and bromine recovery of pcb incineration ash

Applicant:

Beijing University of Technology, Beijing, CN;

Inventors:

Yufeng Wu, Beijing, CN;

Dean Pan, Beijing, CN;

Bin Li, Beijing, CN;

Tieyong Zuo, Beijing, CN;

Assignee:

BEIJING UNIVERSITY OF TECHNOLOGY, Beijing, CN;

Attorney:

Leonid Kisselev

Primary Examiner:

Melissa S Swain

Int. Cl.
CPC ...
C01G 3/00 (2006.01); C01G 3/10 (2006.01); C01G 9/06 (2006.01); C01G 21/20 (2006.01); C22B 7/00 (2006.01); C22B 7/04 (2006.01); C22B 3/00 (2006.01); C22B 15/00 (2006.01); C22B 19/30 (2006.01);
U.S. Cl.
CPC ...
C01G 3/003 (2013.01); C01G 3/10 (2013.01); C01G 9/06 (2013.01); C01G 21/20 (2013.01); C22B 7/007 (2013.01); C22B 7/008 (2013.01); C22B 7/04 (2013.01); C22B 13/045 (2013.01); C22B 15/0065 (2013.01); C22B 19/30 (2013.01);
Abstract

A method of pretreatment and bromine recovery of PCB Incineration ash is disclosed that relates to the field of comprehensive recovery of valuable metals by full wet method, especially relates to a method of valuable metals and bromine recovery, precious metals enrichment in pretreatment process of PCB Incineration ash. The major steps includes alkali leaching, Cu extraction back-extraction, neutralization-precipitation to separate, Bromine evaporative crystallization, regeneration, acid pickling, Zn evaporative crystallization, removal of Zn and Cu. Compared with the traditional comprehensive recovery process of ash, the invention can separate bromine from ash and recover valuable metals such as copper, zinc and lead with the maximum extent, at the same time, the enrichment of silver and other precious metals is beneficial to the subsequent recovery of precious metals. It has high added recovery value and no tailless discharge.

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